dom AND JQUERY

1.文档全部加在完毕后执行

一：$(document).ready(function(){}

二：$().ready(function(){}

三：window.onload=function(){}

 

2.dom转jQuery

var username=document.getElementById("username");
alert(username.value);
var $username=$(username);
alert($username.val());

3.jQuery转dom

var $username=$("#username");
alert($username.val());
一：var obj=$username[0];
二：var obj1=$username.get(0);
alert(obj.value);
alert(obj1.value);

转载于:https://www.cnblogs.com/zszitman/p/4503664.html